:root{
  --bg:#f4f5f3;--surface:#fff;--surface-soft:#f8f9f7;--ink:#18211f;--muted:#66716e;
  --line:#dfe4e1;--line-strong:#c8d0cc;--teal:#087b70;--teal-dark:#05635b;--teal-soft:#e9f6f3;
  --amber:#b66a12;--amber-bg:#fff5e5;--error:#b43b32;--shadow:0 18px 50px rgba(24,33,31,.08);
  font-family:Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI",sans-serif;color:var(--ink);background:var(--bg)
}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;min-width:320px;background:var(--bg)}
button,input,select{font:inherit}button{cursor:pointer}button:disabled{cursor:not-allowed}
.site-head{height:58px;padding:0 clamp(18px,4vw,56px);display:flex;align-items:center;justify-content:space-between;background:#15201e;color:#fff;border-bottom:1px solid rgba(255,255,255,.08)}
.brand{font-size:15px;font-weight:850;text-decoration:none;color:#fff;letter-spacing:-.025em}.brand span{color:#63d4c6}
.head-actions{display:flex;align-items:center;gap:14px}.privacy-chip{font-size:11px;color:#bce5df;border:1px solid rgba(99,212,198,.25);border-radius:5px;padding:6px 9px;background:rgba(99,212,198,.08)}
.quiet-button{border:0;background:transparent;color:inherit;padding:8px 10px}.head-actions .quiet-button{font-size:12px;color:#d8e2df}
.intro{max-width:1320px;margin:0 auto;padding:26px 28px 18px;display:grid;grid-template-columns:minmax(0,1.3fr) minmax(280px,.7fr);gap:54px;align-items:end}
.eyebrow{font-size:10px;font-weight:850;letter-spacing:.17em;color:var(--teal);margin:0 0 8px}
.intro h1{font-size:clamp(29px,3.2vw,46px);line-height:1.08;letter-spacing:-.04em;max-width:820px;margin:0;font-weight:780}
.intro>p{color:var(--muted);font-size:14px;line-height:1.65;margin:0 0 2px;max-width:480px}
.steps{max-width:1320px;margin:0 auto;padding:0 28px 14px;display:flex;align-items:center;gap:0}
.step{min-width:0;display:flex;flex:1;gap:9px;align-items:center;border:0;border-bottom:2px solid var(--line);background:transparent;color:#929b98;padding:10px 6px 11px;text-align:left}
.step b{width:21px;height:21px;display:grid;place-items:center;border:1px solid currentColor;border-radius:5px;font-size:10px;flex:0 0 auto}.step span{font-size:12px;font-weight:700}
.step.active{color:var(--teal);border-color:var(--teal)}.step.active b{background:var(--teal);border-color:var(--teal);color:#fff}
.workspace{max-width:1320px;margin:0 auto 54px;padding:0 28px;display:grid;grid-template-columns:minmax(0,1.45fr) minmax(380px,.72fr);gap:18px;align-items:start}
.stage-card,.controls{background:var(--surface);border:1px solid var(--line);border-radius:8px;box-shadow:var(--shadow)}
.stage-card{min-height:650px;padding:12px;position:sticky;top:14px;overflow:hidden}
.drop-zone{min-height:624px;border:1.5px dashed #b8c6c1;border-radius:6px;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;gap:9px;background:radial-gradient(circle at 50% 36%,#fff 0,#f7faf8 56%,#f0f3f1 100%)}
.drop-zone.drag{border-color:var(--teal);background:var(--teal-soft)}.drop-mark{width:58px;height:58px;display:grid;place-items:center;border-radius:50%;background:var(--teal-soft);color:var(--teal);font-size:34px;margin-bottom:6px}
.drop-zone strong{font-size:18px;letter-spacing:-.02em}.drop-zone span{color:var(--muted);font-size:12px}.drop-zone>div:last-child{display:flex;gap:8px;margin-top:10px}
.primary,.secondary,.tool-button{min-height:38px;border-radius:5px;padding:9px 14px;font-weight:750;border:1px solid transparent;transition:background .15s,border-color .15s,transform .15s}
.primary{background:var(--teal);color:#fff;box-shadow:0 5px 14px rgba(8,123,112,.18)}.primary:hover{background:var(--teal-dark);transform:translateY(-1px)}.primary:disabled{opacity:.42;transform:none;box-shadow:none}
.secondary{background:#fff;border-color:var(--line-strong);color:var(--ink)}.secondary:hover{border-color:#97aaa3;background:#fbfcfb}.small{min-height:36px;padding:8px 13px;font-size:12px}.full{width:100%}.hidden{display:none!important}
.canvas-wrap{min-height:624px;display:flex;flex-direction:column}.canvas-toolbar{display:flex;flex-wrap:wrap;align-items:center;gap:6px;padding:2px 2px 11px}.tool-button{min-height:32px;padding:6px 10px;background:var(--surface-soft);border-color:var(--line);font-size:11px;color:#46514e}.tool-button:hover,.tool-button.active{background:var(--teal-soft);border-color:#9dcac3;color:var(--teal-dark)}.icon-button{min-width:34px;font-size:16px;line-height:1}.toolbar-divider{width:1px;height:24px;background:var(--line);margin:0 2px}.pan-note{font-size:10px;color:var(--muted);margin-left:2px}
.canvas-shell{min-height:540px;display:block;position:relative;overflow:auto;border-radius:5px;background-color:#d9dfdc;background-image:linear-gradient(45deg,#ced5d2 25%,transparent 25%),linear-gradient(-45deg,#ced5d2 25%,transparent 25%),linear-gradient(45deg,transparent 75%,#ced5d2 75%),linear-gradient(-45deg,transparent 75%,#ced5d2 75%);background-size:18px 18px;background-position:0 0,0 9px,9px -9px,-9px 0;padding:16px}
canvas{display:block;margin:auto;touch-action:pan-x pan-y;box-shadow:0 8px 30px rgba(20,30,27,.13);max-width:none;max-height:none}canvas.precision-mode{touch-action:none}.canvas-hint{position:sticky;display:table;bottom:12px;margin:-42px auto 12px;max-width:calc(100% - 24px);background:rgba(21,32,30,.92);color:#fff;padding:7px 10px;border-radius:4px;font-size:11px;pointer-events:none;white-space:nowrap}
.source-meta{display:flex;justify-content:space-between;color:var(--muted);font-size:11px;padding:10px 3px 1px}
.controls{padding:0 18px;overflow:hidden}.control-section{padding:18px 0;border-bottom:1px solid var(--line)}.control-section:last-child{border-bottom:0;padding-bottom:16px}
.section-head{display:flex;gap:10px;margin-bottom:12px;align-items:flex-start}.section-num{width:24px;height:24px;display:grid;place-items:center;background:#eef2f0;color:#5e6d68;border-radius:5px;font-size:10px;font-weight:850;flex:0 0 auto}
.section-head h2{font-size:14px;line-height:1.3;margin:1px 0 2px;letter-spacing:-.01em}.section-head p{font-size:11px;line-height:1.45;color:var(--muted);margin:0}
.summary{padding:10px 11px;border-left:3px solid var(--teal);background:var(--teal-soft);color:#28534d;font-size:11px}.summary.empty{border-color:#abb4b0;background:#f3f5f4;color:#737d79}
.segmented{display:flex;border:1px solid var(--line);border-radius:5px;padding:3px;background:#f1f4f2;margin:9px 0}.segmented button{min-height:32px;flex:1;border:0;border-radius:3px;background:transparent;padding:6px 8px;font-size:11px;color:var(--muted)}.segmented button.active{background:#fff;color:var(--teal-dark);box-shadow:0 1px 4px rgba(0,0,0,.08);font-weight:800}
.field-row{display:grid;grid-template-columns:1fr 1fr 78px;gap:8px}.field-row.two{grid-template-columns:1fr 100px}.field-row label,label{display:grid;gap:5px;font-size:10px;font-weight:650;color:var(--muted)}
input[type=number],select{width:100%;height:38px;border:1px solid var(--line-strong);background:#fff;color:var(--ink);padding:8px 9px;border-radius:5px;font-size:12px}input:hover,select:hover{border-color:#9eaca7}input:focus,select:focus,button:focus-visible{outline:2px solid #55b9ad;outline-offset:2px}
.check{display:flex;align-items:center;gap:7px;margin-top:9px;font-weight:600}.check input{accent-color:var(--teal)}.inline-note,details p{font-size:11px;color:var(--muted);line-height:1.5}
.preflight-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:7px}.preflight-grid div{background:#f4f6f5;border:1px solid #edf0ee;border-radius:5px;padding:9px}.preflight-grid span{display:block;font-size:9px;text-transform:uppercase;letter-spacing:.04em;color:var(--muted)}.preflight-grid strong{display:block;margin-top:3px;font-size:17px;color:#26322f}
.notice{font-size:11px;line-height:1.5;padding:9px 10px;margin:8px 0;border-radius:4px}.notice.neutral{background:#f1f3f2}.notice.warn{background:var(--amber-bg);color:#74430c}.notice.good{background:var(--teal-soft);color:#205a52}
input[type=range]{width:100%;accent-color:var(--teal)}details{margin-top:10px;border-top:1px solid #e8ebe9;padding-top:9px}summary{font-size:11px;font-weight:750;cursor:pointer;color:#4c5955}.check-grid{display:flex;gap:18px}
.layout-preview{display:flex;gap:12px;align-items:center;border:1px solid var(--line);border-radius:5px;padding:10px;margin:11px 0;background:#fafbfa}.mini-grid{width:72px;height:54px;display:grid;gap:2px;background:#dfe4e1;padding:2px;flex:0 0 auto}.mini-grid i{background:#fff;border:1px solid #c6ceca;font-style:normal;font-size:7px;display:grid;place-items:center}.layout-preview strong{font-size:12px}.layout-preview p{font-size:10px;color:var(--muted);margin:3px 0 0}
#downloadButton{height:44px;display:flex;align-items:center;justify-content:center;gap:9px;font-size:13px}#resetButton{margin-top:5px;color:var(--muted);font-size:11px}.status{min-height:17px;margin-top:7px;font-size:11px;line-height:1.45;color:var(--teal)}
.how-it-works{max-width:1320px;margin:0 auto;padding:48px 28px 62px}.how-it-works h2{font-size:28px;letter-spacing:-.035em;margin:0 0 23px}.explain-grid{display:grid;grid-template-columns:repeat(4,1fr);border-top:1px solid var(--line)}.explain-grid article{padding:20px 28px 8px 0}.explain-grid b{color:var(--teal);font-size:10px}.explain-grid h3{font-size:14px;margin:18px 0 7px}.explain-grid p{font-size:12px;line-height:1.6;color:var(--muted);margin:0}footer{border-top:1px solid var(--line);padding:20px;text-align:center;font-size:11px;color:var(--muted);background:#eef1ef}
.field-row.keyboard-four{grid-template-columns:repeat(4,1fr);margin-bottom:8px}.field-row.keyboard-four input{height:34px;padding:6px}
@media(max-width:980px){.intro{grid-template-columns:1fr;gap:12px}.intro>p{max-width:680px}.workspace{grid-template-columns:1fr}.stage-card{position:static;min-height:auto}.drop-zone,.canvas-wrap{min-height:480px}.canvas-shell{min-height:420px}.explain-grid{grid-template-columns:1fr 1fr}.privacy-chip{display:none}}
@media(max-width:560px){.site-head{padding:0 15px}.intro{padding:24px 16px 15px}.intro h1{font-size:30px}.steps{padding:0 12px 12px}.step{justify-content:center}.step span{font-size:9px}.workspace{padding:0 12px;gap:12px}.stage-card{padding:8px}.controls{padding:0 14px}.drop-zone{min-height:360px}.canvas-wrap{min-height:400px}.canvas-shell{min-height:350px}.canvas-hint{white-space:normal;text-align:center}.canvas-toolbar .tool-button{min-height:44px;min-width:44px;padding:9px 12px}.canvas-toolbar .icon-button{font-size:18px}.toolbar-divider{height:34px}.pan-note{width:100%;padding-top:2px}.field-row{grid-template-columns:1fr 1fr}.field-row.keyboard-four{grid-template-columns:1fr 1fr}.field-row .unit-field{grid-column:1/-1}.preflight-grid{grid-template-columns:repeat(3,1fr)}.explain-grid{grid-template-columns:1fr}.how-it-works{padding:42px 18px}.drop-zone>div:last-child{flex-direction:column;width:min(230px,80%)}.drop-zone .small{width:100%}}

/* Atelier UI v2 */
:root{--bg:#f1efe8;--surface:#fffefb;--surface-soft:#f7f6f1;--ink:#18221f;--muted:#68736f;--line:#d9ded9;--line-strong:#bbc6c0;--teal:#136f65;--teal-dark:#0b554e;--teal-soft:#e7f2ef;--amber:#c37a20;--shadow:0 16px 44px rgba(31,44,40,.07)}
body{background:radial-gradient(circle at 8% 0,rgba(195,122,32,.055),transparent 28rem),var(--bg)}
.site-head{height:56px;background:#14211e;padding-inline:clamp(18px,3.5vw,54px);box-shadow:0 1px 0 rgba(0,0,0,.18)}
.brand{display:flex;align-items:center;gap:9px;font-size:14px;letter-spacing:-.015em}.brand:before{content:"";width:22px;height:22px;border:1px solid rgba(255,255,255,.24);background:linear-gradient(135deg,#54b9aa 0 46%,#14211e 47% 53%,#d89a47 54%);box-shadow:inset 0 0 0 3px #1d302c}
.privacy-chip{border-radius:3px;padding:5px 9px;letter-spacing:.01em}.head-actions .quiet-button{min-height:36px;border-left:1px solid rgba(255,255,255,.12);padding-left:14px}
.intro{padding:22px 28px 14px;gap:46px;grid-template-columns:minmax(0,1.45fr) minmax(300px,.55fr)}
.intro h1{font-size:clamp(28px,3vw,42px);line-height:1.06;font-weight:720;max-width:760px}.intro>p{font-size:13px;line-height:1.65;padding-left:18px;border-left:2px solid #d7a35e}.eyebrow{color:#8f5b1c;font-size:9px;margin-bottom:7px}
.steps{padding-bottom:12px}.step{position:relative;padding:8px 8px 10px;border-bottom-width:1px}.step:after{content:"";position:absolute;right:-3px;bottom:-3px;width:5px;height:5px;border-radius:50%;background:var(--line)}.step:last-child:after{display:none}.step b{border-radius:3px;background:#f8f8f5}.step.active{border-bottom-width:2px}.step.active b{box-shadow:0 3px 9px rgba(19,111,101,.22)}
.workspace{gap:16px}.stage-card,.controls{border-radius:6px;border-color:#d4dad6}.stage-card{background:#1c2926;padding:10px;box-shadow:0 20px 55px rgba(23,35,31,.15)}
.drop-zone{position:relative;isolation:isolate;overflow:hidden;border-radius:3px;border-color:#aebbb5;background:#f9faf7}.drop-zone:before{content:"";position:absolute;z-index:-1;inset:-20%;opacity:.5;background:linear-gradient(45deg,transparent 48.8%,rgba(19,111,101,.08) 49% 51%,transparent 51.2%),linear-gradient(-45deg,transparent 48.8%,rgba(195,122,32,.07) 49% 51%,transparent 51.2%);background-size:110px 110px;transform:rotate(3deg)}.drop-zone:after{content:"";position:absolute;z-index:-1;width:360px;height:360px;border:1px solid rgba(19,111,101,.1);transform:rotate(45deg);background:rgba(255,255,255,.66)}
.drop-mark{position:relative;width:62px;height:62px;border-radius:4px;background:#17332e;color:#70c7ba;font-size:29px;box-shadow:8px 8px 0 rgba(195,122,32,.18)}.drop-zone strong{font-size:19px}.drop-zone span{font-size:11px}.drop-zone>div:last-child{position:relative}
.canvas-toolbar{padding:3px 2px 10px}.tool-button{color:#d6dfdc;background:#263733;border-color:#3a4b47}.tool-button:hover,.tool-button.active{background:#dceee9;color:#104f48;border-color:#75aa9f}.toolbar-divider{background:#455651}.pan-note{color:#9eaaa6}.reset-tool{min-height:44px;margin-left:auto;padding-inline:14px;background:#f5eee2;border-color:#d7b786;color:#68451e;font-size:12px}.reset-tool:hover{background:#fff5e5;border-color:#e0a953;color:#5b3812}.canvas-shell{border-radius:3px;background-color:#d7dcda}.source-meta{color:#aeb9b5}
.controls{background:#fffefb;padding-inline:20px;box-shadow:0 14px 42px rgba(34,46,42,.06)}.control-section{position:relative;padding:17px 0}.control-section:before{content:"";position:absolute;left:-20px;top:17px;width:2px;height:24px;background:transparent}.control-section:has(.summary:not(.empty)):before,.control-section:last-child:before{background:var(--teal)}
.section-num{border-radius:3px;background:#edf0ed;color:#53615c}.section-head h2{font-size:14px;font-weight:760}.section-head p{max-width:320px}.summary{border-left:0;border-radius:3px;box-shadow:inset 3px 0 0 var(--teal)}
.segmented{border-radius:4px;background:#eef1ef}.segmented button{min-height:34px;border-radius:2px}.segmented button.active{color:#0f5d55;box-shadow:0 2px 8px rgba(30,48,43,.1)}
input[type=number],select{height:40px;border-radius:3px;background:#fffefc}.preflight-grid{gap:6px}.preflight-grid div{position:relative;border-radius:3px;background:#f2f4f1;padding:10px}.preflight-grid div:after{content:"";position:absolute;left:10px;right:10px;bottom:0;height:2px;background:#d9e1dd}.preflight-grid div:first-child:after{background:#5ba99e}.preflight-grid strong{font-size:18px;font-variant-numeric:tabular-nums}
.notice{border-radius:3px}.notice.good{box-shadow:inset 3px 0 0 #3b9b8d}.notice.warn{box-shadow:inset 3px 0 0 var(--amber)}details{padding:10px 0 0}summary{list-style:none;display:flex;align-items:center;gap:7px}summary:before{content:"+";width:16px;height:16px;display:grid;place-items:center;border:1px solid #b8c2bd;color:#53615d;font-size:11px}details[open] summary:before{content:"−"}
.layout-preview{border-radius:3px;background:#f5f6f3;border-style:dashed}.mini-grid{background:#24332f;padding:3px}.mini-grid i{border:0;color:#50605b}.primary{border-radius:3px;background:#126f65;box-shadow:0 7px 18px rgba(18,111,101,.2)}#downloadButton{height:46px;letter-spacing:.01em}#resetButton.reset-project-button{min-height:44px;margin-top:8px;border-color:#b8c4be;color:var(--ink);font-size:13px}.status{font-weight:600}
.how-it-works{padding-top:38px}.how-it-works h2{font-size:26px}.explain-grid article{border-right:1px solid var(--line);padding-left:18px}.explain-grid article:first-child{padding-left:0}.explain-grid article:last-child{border-right:0}.explain-grid h3{margin-top:14px}footer{background:#17231f;color:#9faeaa;border:0}
@media(max-width:980px){.intro{grid-template-columns:1fr;gap:10px}.intro>p{padding-left:0;border-left:0}.stage-card{background:#1c2926}.control-section:before{left:-20px}}
@media(max-width:560px){.site-head{height:52px}.brand{font-size:13px}.brand:before{width:20px;height:20px}.intro{padding-top:20px}.intro h1{font-size:27px}.intro>p{font-size:12px}.steps{padding-bottom:10px}.workspace{padding-inline:10px}.stage-card{padding:6px}.controls{padding-inline:14px}.control-section:before{left:-14px}.drop-zone:after{width:250px;height:250px}.reset-tool{width:100%;margin-left:0;justify-content:center}.explain-grid article{border-right:0;border-bottom:1px solid var(--line);padding-left:0}.explain-grid article:last-child{border-bottom:0}}